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We are asked to translate the following sentence: "Caesar didn't make an attack on the cavalry on the right wing, did he?"

The key has this as "Num Caesar impetum equitatum a cornu dextro fecit."

This troubles me for several reasons. Firstly, I am sure this is not the translation that D'Ooge intended, because in the special vocabulary for this lesson, "impetus facere in" appears as "make an attack on," exactly as you see in the above English which is to be translated. Clearly, D'Ooge wants us to use "impetus facere in + accusative." But the key does not use it, or if it does, it leaves out the "in."

Instead the preposition "a/ab" is used. This makes no sense to me. Doesn't that mean, in context, "away from the right wing (of the army)?"

I would just like the experts here to let me know if I'm right, or if I'm losing my mind. Shouldn't the Latin be something more like "Num Caesar impetum in equitatum in cornu dextro fecit?" Thanks!

This does not have to be an error in the key. Using Google to make a site-search of TheLatinLibrary.org via site:thelatinlibrary.com "a cornu dextro" I found several instances of similar phrases. It seems that both in dextro cornu and a dextro cornu are valid.

Thank you. I wasn't sure about the use of the ablative being an error. My problem was more that D'Ooge wanted that sentence to be constructed using impetus facere in + accusative, since that was part of the lesson. And I doubt he had a rare use of the ablative in mind when he is just teaching the basics for clods like myself... However, I am just glad someone put up a key at all, so don't think I'm ungrateful!